Fuse



A. L. EUSTICE.

FUSE.

APPLICATION FILED HAR. 7| 1918.

-Patented Feb. 10, 1920.

i L w im d i fusible member cupped to forman air space.,

ALFRED L. EUSTICE, OF CHICAGO, ILLINOIS.

` FUSE.

Specification of Letters Patent.

Patented Feb. 10, 1920.

Application inea March 7, 1918. Serin No. 220,963.

To all 'whomz't may concern.'

Be it known that I, ALFRED L. EUsTIoE, a citizen ofthe United States, and resident of Chicago, in the county of Cook and State of Illinois,` have invented certain new and useful Improvements in Fuses, of which the following is a specification.

This invention relates to fuses. l

One of the objects of the invention is to increase the sensitiveness of fusible elements whereby definite results may be had.

Another object isto form a fuse air chamber in a novel manner to meet the various requirements for successful commercial operation.

These and other objects are accomplished by providing in combination, a fusible member having a portion thereof cupped for providing air space within the member, and means for inclosing the air space for confining generated heat.

The invention is illustrated on theaccompanying sheet of drawings in which,

Figurel is a longitudinal sectional view of a fuse embodying my invention.

Fig. 2 is a transverse sectional view, taken on the plane of line 2-2 of Fig. 1.

Fig. -3 is a longitudinal sectional view, taken at a different angle from that shown in Fig. 1.

Fig. 4 is a fragmentary sectional view, taken on the plane 4 4 of Fig. 1, and

Fig. 5 is a fragmentary plan view of a The various novel features of my invention-will be apparent from the following description and drawings and will be particularly pointed out in the appended claims.

Referring to the figures of the drawings, it will be notedthat I have shown a fuse in cluding a cylindrical casing 10,-preferably of insulating material, the ends of which Q casing are closed by metallic caps 11. EX-

tending diametrically through the casing and electrically connected to the caps are terminal straps 12, to which are connected the ends of a fusible element or link 13. The casing contains any suitable insulating material 14, such as asbestos, or the like, for dissipating the heat and providing minute paths for the escape of the vapor or ases arising or evolved upon the melting o the fusible element.

It is well appreciated that if a portion of the fusible member is confined within an air .space orlif the airspace is associated in a suitable manner with respect to the .fusible member that the melting point of the fuse nular wall 15, which tapers or becomes nar-l rower toward its outermost extremity. This narrowing of the metal is caused during the cupping action, it being understood that the bottom of the cup is removed as an element of the fusible member. lTo confine the air within the space 16, formed by the cupping of the fusible member two disks 17 and 18 are provided for closing the ends of the annular wall 15. These disks either may be pasted lto the fusible member 13 or may be held thereto by a bolt or nut arrangement 19, as shown in the figures of the drawing.

By havin' the metal forming thewall 15 tapered, an by having the closed air space 16 formed in th'e manner shown, the generated heat, caused by the passage of current through the fusible member is definitely known and this heat is retained within the air space in a manner to cause the melting of the fusible' member upon the occurrence of a predetermined load. This fusible member or fuse link may be described as having a pocket wherein generated heat is retained.

In this way a fuse is provided which will safeguard the circuit and the devices connected therein ina'manner tomeet all the requirements for a successful operation.

It is my intention to cover all modifications falling within the scope of the following claims. l

I claim:

1. In a fuse, a fusible member having a portion thereof cupped for providing an air space within the fusible member, and means for closing the air space for confining generated heat.

2. In a fuse, a fusible member having a portion thereof cu ped for .providing an air space within the usible member, and disks for closing the ends of the cupin the fusible member for confining generated heat.

3. In a fuse, a fusible member having aportion thereof offset to form a recess therein, and means for inclosing the recess for confining generated heat.

4. In a fuse, a fusible member a portion of which'has its metal offset to 'form an air space, and means for closing the air space for confining generated heat.

5. In a fuse, a fusi-blemember a portion of which is pressed forming a tapering Wall, and means tor confining generated neat adjacentthe vali for increasing the sensitiveness oi the fusible member.

6. In a fuse, a fusible member having a portion thereof pressed laterally to form au inelosing wa1l,and means for closing the ends of said Wall for confining generated heat.

7.A In a fuse,I a fusible member having the metal of a portion thereof pressed outwardly to :form4 a continuousv laterally extending' ivaii, and nsu'ating members for eiosing'tiie ends of said wel! for conning generated heat therein.

8. A fuse link having a eosed heat retaining' pocket formed therein.

Signed at Chicago', Illinois, this 21st day of February, 1918.

.ALFRED L. EUSTICE.

Witnesses:

CHAs. L. BYRON, L. E. HANNEN.' 

